It's in Chapter form but not necesary in the right order, so check them carefully. where i remebered the location i have formulated the description to make it easier to understand, gamefaq had some strange sentencing.

no chapter:

Auto Loader:
Don't "Die" on normal or higher, simply quit if you die and continue from the main menu to prevent deaths from counting.

Bind 1:
Complete Dodge Master mission by dodging enemy attacks 20 times.

Charge Shot 3:
You get this by completing the game on Casual difficulty.

M92F at start.

PC356 –
Location. You can get this by completing the B.O.W Hunter mission which involves killing 150 enemies. It appears in a weapon crate.

G18 –
Location. You can get this by completing the Secret Sign 30 mission after scanning 30 handprints. It appears in a weapon crate.

PSG1 –
Location. You can get this by completing the Secret Sign 15 mission after scanning 15 handprints. It appears in a weapon crate.

Hydra –
Location. After beating the game in Normal mode, this appears in the weapon crate on the New Game+ playthrough.

Edge Runner 2:
Complete the Researcher mission (scan all enemies) to get this upgrade.

Long Magazine 2:
complete the Angry Fist mission (successfully land 10 fully charged melee attacks) to get it as a reward.

Chapter order.
Chapter 2

HG Ammo Case: 2-2 Bridge

Damage 1:
Found in Episode 2, Scenario 2. It’s on top of a cabinet near the iron door that Parker and Jill have to break down to retrieve their weapons in the Storage Hallway.

Fire Rate 1:
Episode 2, Scenario 2 has one in the small corridor near the bottom floor of the Dining Room. You’ll find it near the top of the cabinet.

Fire Rate 2:
In Episode 2, Scenario 2. In the Promenade area, before lifting the shutter, move down the stairs across from the shutter and you’ll find this upgrade on a table.

Chapter 3

Shotgun (WYnham) in a side room on the way back to the room you woke up in defensless. after you have found the sigil, on the wall.

SG Ammo Case: 3-2 a stall floor space, promenade

M40A1 – (Episode 3, Scenario 2)
Location. You’ll find this rifle propped up against a shelf in the storage hallways of the Promenade area. There is a weapon crate near here.

Burst 1:
Found in Episode 3, Scenario 2. After you possess the Helm key, unlock the door to Guest Room 4 in the Upper Cabins area. Scan below the bed in the cabin to find this.

Damage 2:
Found in Episode 3, Scenario 2. It’s located in the Conference Room where you get the Helm Key. It’s lying on the table.

Fire Rate 1:
Episode 3, Scenario 2. Solve the puzzle in the Solarium to unlock the door to the control room. It’s on a table beside the pump controls.

Long Magazine 1:
Located in Episode 3, Scenario 2. You’ll find the upgrade on the bottom floor of the Grand Hall, lying in a wall indention to the right of the doors that lead to the Promenade.

BEFORE ENDING MISSION BY GOING TO COM ROOM GO TO THE HIGHEST ROOM IN THE TALL ROOM AND TURN ON THE WATER PURIFIER MAKES IT SO YOU CAN PICK UP GOOD STUFF NEXT CHAPTER!!!!.

Chapter 4

HG Ammo Case: 4 Casino
MG Ammo Case: 4 Diving Board Solarium

MP5 – (Episode 4, Scenario 1)
Location. After reentering the Hallway with Broken Windows in Episode 4, unlock the iron door with the iron anchor key. You’ll find the MP5 in this room.

Long Magazine 2:
Episode 4, Scenario 1; First turn on the water purifier in the control room in episode 3, then swim to the other side of the pool in the solarium in episode 4 scenario 1. There is a Long Magazine on the chair here.

Infighter 1:
In Episode 4, Scenario 1. In the Cafeteria area, use the Iron Anchor Key to unlock the Captain’s Dining Room and find this on the small table inside.

Charge Shot 1:
Found in Episode 4, Scenario 1. To obtain it, turn on the water purifier in the control room of the Solarium in Episode 3 then reenter the Solarium in Episode 4/Scenario 1. Swim to the other side of the now filled pool. You’ll find the upgrade on a counter on the other side.

Critical 1:
Located in Episode 4, Scenario 1, you can get this by scanning the area below the lamp in the VIP Room in the Casino area.

Daze 3:
Episode 4, Scenario 1. Go back to the Detention Room, where the dummy of Chris was located in Episode 1 and scan the yellow containers off to the right inside the room.

Long Magazine 2:
(when you fight Rachel alone and have to chase after her, secontion after the "surprise" think it was scan to find it) After Rachel is fought off and made to retreat in the Examination room. She will appear after exiting the Examination Room. This part will be on the floor after she crawls into the vent.

Chapter 5

MG Ammo Case: 5-2 start playback on the south side near the equipment, bottom compartment.

Daze 1:
In Episode 5, Scenario 2. While in the Engine Room Corridor, step through the left door and find this off to the right in the flooded lower portion of the Engine Room.

AUG – (Episode 5, Scenario 4)
Location. Past the lower level of the Engine Room, Jill steps out onto a walkway with water below it. Go down the stairs into the Tank Room on the right and you’ll find the AUG on a table there.

Chapter 6

Rifle Ammo Case: 6-2 Boss room, Observatory
SG Ammo Case: 6-2 after escaping from chamber passage of heavenly power was flooded, bottom compartment

Damage 3:
Episode 6, Scenario 2.You can find this after the boss fight with the Draghignazzo in the observatory in Scan the middle portion of the floor near the windows.

Chapter 7

MG Ammo Case: 7-1 box near the weapon Observatory

Python – (Episode 7, Scenario 1)
Location. After you get the Veltro key card from episode 6, go to the hallway in between the Dining Room and the Library in the Cafeteria area of the ship and unlock the door in that hallway with the card. This weapon is lying on the desk in the back of the Small Library behind the door.

Burst 2:
Found in Episode 7, Scenario 1. After obtaining the Veltro key card in Episode 6, return to the Hallway with Paintings in the Cafeteria area and unlock the safe at the end of the hall to get this.

Burst 4:
Found in Episode 7, Scenario 1. You get this by knocking out Rachel by damaging her in the cafeteria area.

Damage 4:
conference room in Episode 7, Scenario 1 in the bridge area of the ship. You’ll need to use the Veltro keycard to unlock the safe on the wall.

Daze 2:
In Episode 7, Scenario 1, use the Veltro keycard to open the safe in the Guest Cabin near the Heliport.

Bind 2:
Found in Episode 7, Scenario 2. Rachel will drop this after you defeat her in the Cargo Room.

Magnum Ammo Case, 7-2 after you get out of the elevator and find Rachel, jump down a ladder and behind a long range enemie is the case, keep in mind that you can get this in chapter 8 if you miss it, simply swim here and pick it up then.

Infighter 2:
You can get this in Episode 7, Scenario 2. The Scagdead in the Cargo Room drops this after dying.

Long Magazine 3:
Episode 7, Scenario 2. While at the bow of the ship, as soon as the scenario begins, scan the bottom portion of the UAV to reveal this.

Chapter 8

Rifle Ammo Case: 8-1 bottom of the compartment just before the lift stations are with a ladder.

Fire Rate 3:
Found in Episode 8, Scenario 1. While swimming out of the Bilge area, once Jill reenters the Maintenance Room, you’ll find this on top of the water tank inside.

Damage 4:
Episode 8, Scenario 1. When you’re swimming through the Water Corridor, outside the Engine Room area, this part will be on a catwalk above the door that Jill enters this area from.

Long Magazine 3:
Second, in Episode 8, Scenario 1, you can find this by going in the water in the Lift area. The upgrade is on top of a crate on the catwalk near the top of the water.

Weapon: L. Hawk – (Episode 8, Scenario 2)
Location. This is lying on a stool in the Experiment Room. This is the same room where Jill and Chris fight a Scarmiglione for the first time.

Weapon: M3 (SG), Gotten from criss and G36 (MG).

Long Magazine 4:
in Episode 8, Scenario 3 you can get this after fighting the Scarmiglione. enter the Sterilization Room that Chris was trapped in and scan the floor off to the left to find it.

Narrow 1:
Found in Episode 8, Scenario 3 in the Locker Room, outside the sterilization rooms. The upgrade will be on a bench to the left.

Chapter 9

MG Ammo Case: 9-2 in the fingerprint authentication into the upper room, research facility.

Charge Shot 2:
Located in Episode 9, Scenario 2. After flooding the lab, swim to the north side of the outside portion of the pool and you’ll find this floating outside of a closed shutter.

Damage 5:
Found in Scenario 2 of Episode 9, look in the Hall to the Virus Preparation room and you’ll see it on a metal table on the very top platform past the railing.

Chapter 10

Burst 6:
Found in Episode 10, Scenario 1. While playing as Parker, defeat Rachel in the Cafeteria area.

Long magazine 4:
obtained in Episode 10, Scenario 2. In the first flooded corridor that Jill drops into she will be swimming and some pipe

Government – (Episode 10, Scenario 2)
Location. You find this after the section of the scenario where Jill escorts Parker. It’ll be on the catwalk bridge behind Jill once the timer starts for the triggering system.

Edge Runner 1:
Found during Episode 10, Scenario 2. You’ll find this upgrade attached to the Government handgun that Jill can pick up on the Catwalk Bridge.

HG Ammo Case: 10-2 near some burning debre after you exit a door.
SG Ammo Case: 10-2 when jill ducks below crates that are falling outside when the ship is tilted back, go back to where you came from and it's next to the door.

Fire Rate 4:
Episode 10. Scenario 2,

Chapter 12

Rifle Ammo Case: 12-1 south of the underwater room.

Infernal:

Chapter 1

Burst 3:
Episode 1, Scenario 1. It’s on some crates near a vent in the first room that you enter after stepping inside the ship.

Chapter 3

Magnum Ammo case: 3-2 safe room with a vase next to elevator bow deck.

Charge Shot 4:
Episode 3, Scenario 2 when you enter the Solarium through the Grand Hall. Solve the puzzle to unlock the door to the control room and find this lying on a control part near the back of the room.

Long Magazine 5:
Episode 3, Scenario 2. Go to the Upper Cabins after finding the Helm Key then unlock the door in the elevator corridor. Scan the side of the left cabinet closest to the entrance door to find this upgrade.

Damage 6:
Episode 3, Scenario 2. Unlock the door to the Study with the Helm Key then scan the side of the table closest to the map on the wall to reveal this upgrade.

Chapter 4

Rifle Ammo case: 4 Between the slot and the first floor, casino.
Magnum Ammo Case: Solarium (if purifier is on in chapter 3 else later)

P90 Solarium.( MG )

Infighter 3:
Episode 4, Scenario 1. Go to the Dining Room and unlock the door with the Iron Anchor symbol. Then scan the floor near the chair inside the Captain’s Dining Room to find it.

Chapter 5

HG Ammo case: 5-2 The lower floor room next to the custom parts Power bottom compartmen.
SG Ammo case: 5-2 South aisle of machinery maintenance room: bottom compartment.
Chapter 6

Critical 2:
Episode 6, Scenario 2. You can find this after the boss fight with the Draghignazzo in the observatory Scan the floor near the windows on the opposite side of the room to get it, near the elevator that doesn’t work.

Fire Rate 5:
Episode 6, Scenario 2. After the Draghignazzo boss fight and obtaining of the Veltro keycard. This will be on the walkway that leads to the antenna.

Chapter 7

Rifle Ammo Case: 7-1 weapon box, bow deck

Long Magazine 6:
Episode 7, Scenario 2. It’s lying on top of a container near the side of the bottom floor with the ladder by it. It will not be there at the beginning of Episode 8.

Chapter 8

HG Ammo Case: 8-3 just off the left hand last passage, elevator, partition quarantine.
MG Ammo Case: 8-3 add using the card key passage from lift.

Chapter 10

Burst 5:
Episode 10, Scenario 2. Once the ship tilts, two wooden crates will slide by Jill and crash against the door below. One of the crates has this custom part in it, so run back and grab it.

Chapter 12


SG Ammo Case: 12 north of the dining room
Damage 7:
Episode 12, Scenario 1. You’ll find it in a waterway while moving toward the middle power room.

All information was "borrowed" from http://segmentnext.com/2013/05/20/resident-evil-revelations-weapons-and-upgrades-locations/ and https://www.gamefaqs.com/ps3/700994-resident-evil-revelations/faqs/67108